JPH0375499A - Washing device for air preheater - Google Patents

Abstract

PURPOSE:To assure uniform washing action and shorten washing time by providing a control device for issuing a switching command to actuate a driving mechanism such that a high pressure water nozzle header is displaced toward the periphery of a fixed element. CONSTITUTION:An automatic traveling high pressure water nozzle header 20 moves along a rail 19 in the radial direction along a rail of a fixed element 5 to wash the fixed element 5. Once the high pressure water nozzle header 20 reaches the end of the rail 19, limit switches 45, 46 attached to the high pressure water nozzle 20 detect it, and issue signals 54, 57. A control device 55, once receiving the signals 56, 57, issues a traveling direction command 58 to the high pressure water nozzle header 20 to reverse the traveling direction of the high pressure water nozzle header 20 and issues a switching command 60 to a driving mechanism 15 to displace the high pressure water nozzle header 20 in the direction of the periphery of the fixed element 5 until a limit switch 51 delivers a signal 59. Hereby, uniform washing action is yielded and washing time is shortened.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a water washing device for an air preheater.

[Conventional technology] The air preheater will be explained using FIGS. 12 to 16.

1 is a main body of an air preheater that exchanges heat between high-temperature exhaust gas 2 and air 3; 4 is a fixed element 5 disposed in the center of the main body 1 and partitioned radially into a unit; A cylindrical stator 6 is provided on the end face of the stator 4 so as to cover a part of the fixed element 5, and is a symmetrical butterfly-shaped air 3 inlet side that rotates in the circumferential direction while sliding on the end face of the stator 4. The air hood 7 is connected to the air hood 6 on the air 3 inlet side via the main shaft 8 and is a pair of air hoods on the air 3 outlet side that rotate synchronously. It is designed to flow between .7 and 7. 9. IO is the inlet and outlet air duct connected to each air hood 6.7 via a rotary seal 11; 12.13 is the air hood S of the fixed element 5;
, exhaust gas ducts on the inlet and outlet sides of the exhaust gas 2 that pass the high-temperature exhaust gas 2 from the direction opposite to the air 3 to parts other than those covered by the air 3; 14 is attached to the air hood 6 on the air 3 inlet side and A pin rack 15 is attached to the side of the main body 1 of the air preheater and drives a pinion 16 that meshes with the pin rack 14. i7 is a drive mechanism provided on the main shaft 8 and has air hoods 6.7 on the inlet and outlet sides. This is a soot blower that rotates the end faces of the fixed element 5 on the inlet and outlet sides of the exhaust gas 2 in the circumferential direction in synchronization with the soot blower.

Next, the operation will be explained.

The drive mechanism 15 is operated to synchronize the air hoods 6.7 on the inlet and outlet sides in the circumferential direction of the fixed element 5 via the pinion 16 and pin rack 14, and the high temperature exhaust gas 2 is supplied to the exhaust gas duct 12 on the inlet side. is supplied, and air is supplied to the air duct 9 on the inlet side.

The high-temperature exhaust gas 2 entering from the exhaust gas duct 12 on the inlet side in FIG. The fixed element 5 is heated by the thermal energy in the high-temperature exhaust gas 2, and the exhaust gas 2 whose temperature has decreased after heating the fixed element 5 is discharged to the outside from the exhaust gas duct 13 on the exit side in FIG.

On the other hand, air 3 enters from the air duct 9 on the inlet side in Figure 12.
As described above, the air hoods 6 and 7 rotate synchronously as shown in FIG. 15, and are heated from the air hood 6 on the inlet side through the heated fixed element 5, and then to the air hood 7 on the outlet side. It is led out and sent to an external supply destination through the air duct 10 on the outlet side.

Also, to prevent sulfuric acid, ash, etc. contained in the exhaust gas 2 from adhering to and clogging the fixed element 5 through which the high-temperature exhaust gas 2 passes, air, steam, etc. are periodically blown into the fixed element 5 from the soot blower 17 during operation. to clean the fixing element 5.

However, in the fixed element 5, the temperature at the outlet side of the high-temperature exhaust gas 2 tends to be below the dew point of sulfuric acid, so the sulfuric acid contained in the exhaust gas 2 condenses and sticks to the outlet side of the fixed element 5. The ash contained in the exhaust gas 2 tends to adhere and cause blockages, and the soot blower 17 has a weak cleaning power. It is necessary to wash the ash anew.

Conventionally, during such periodic inspections, low-pressure water is jetted from the soot blower 17 to clean the fixed element 5, or a worker holds a hose that spouts high-pressure water to clean the fixed element.

[Problems to be Solved by the Invention] However, when low-pressure water is jetted from the soot blower 17, there is a problem that the cleaning power for the fixed element 5 is weak (the soot blower 17 cannot withstand high-pressure water jetting due to its structure). When spouting high-pressure water from a hose, there was a problem in that a worker had to be present all the time, making the work time-consuming.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a washing device for an air preheater that can automatically and reliably wash a fixed element during periodic inspection.

[Means for Solving the Problems] The present invention is a cylindrical body provided in the center of a main body 1 of an air preheater that exchanges heat between high-temperature exhaust gas 2 and air 3, and whose interior is partitioned radially. A fixed element 5, a pair of air hoods B and 7 facing each other at both the inlet and outlet sides of the exhaust gas 2 of the fixed element 5 and rotating synchronously along the end surfaces of the fixed element 5, and the air hoods 8 and 7. a drive mechanism 15 and a rail 19 in the radial direction of the fixing element 5 provided in the air hood B on the gas outlet side of the fixing element 5;
A self-propelled high-pressure water nozzle header 20 that runs along the rail 19, and a limit switch 45.4 that is attached to the high-pressure water nozzle header 20 and detects both ends of the rail I9.
6, a limit switch 51 that detects the circumferential displacement amount of the fixed element 5 of the ladder 20 to the high-pressure water nozzle, and signals 56, 5 from each of the limit switches 45, 48, and 51.
7.59, when the high pressure water nozzle header 20 reaches the end of the rail 19, the high pressure water nozzle header 20
a control device 55 that outputs a running direction command 58 that reverses the running direction, and outputs a switching command 60 that operates the drive mechanism 15 so that the position of the high-pressure water nozzle header 2o is displaced in the circumferential direction of the fixed element 5; The rail 19 is a pin rack 61, and the running wheel provided on the high-pressure water nozzle header 20 is a pinion gear 62 that meshes with the pin rack 61. A cylindrical fixed element 5 that is installed in the center of the main body of the air preheater that performs heat exchange between high-temperature exhaust gas 2 and air 3, and that is connected to the water washing device of the vessel and has a radially partitioned interior. , exhaust gas ducts 12.11 on the inlet side and outlet side connected to both ends of the fixed element 5, and exhaust gas ducts 12.11 provided inside the exhaust gas duct 12.18 and facing each other on both end surfaces of the fixed element 5. A pair of air hoods 6 that rotate synchronously along the
．． 7 and a radial rail 1 of the fixing element 5 provided in the air hood 8 on the gas outlet side of said fixing element 5.
9, a high-pressure water nozzle header 20 arranged to be movable along the rail 19, and a pair of gears 65, 66 located at both ends of the rail 19 provided in the air hood B on the gas outlet side. , a chain BT having a hook 75 that is stretched between the gears 65 and 8e and pushes the high-pressure water nozzle header 20, an impeller B9 provided coaxially with the gear B5 on the outer peripheral side of the fixed element 5, and a chain BT on the gas outlet side. This relates to a water washing device for an air preheater, which is fixed to the exhaust gas duct 13 and consists of a claw that engages with an impeller 69.

[Operation J According to the first and second inventions, the self-propelled high-pressure water nozzle header 20 cleans the fixed element 5 while moving in the radial direction of the fixed element 5 along the rail 19.

When the high pressure water nozzle header 20 reaches the end of the rail 19, the limit switch 45.46 attached to the high pressure water nozzle header 20 detects this and outputs a signal 58.57.

When the control device 55 receives the signals 56 and 57, it outputs a running direction command 58 to the high-pressure water nozzle header 20 to reverse the running direction of the high-pressure water nozzle header 20, and outputs a switching command 60 to the drive mechanism 15. air hood 6.7,
The high pressure water nozzle header 20 is fixed via the rail 19 until the limit switch 51 outputs the signal 59.
Displace it in the circumferential direction.

Thereby, the high-pressure water nozzle header 20 cleans the fixed element 5 in the radial direction while being displaced in the circumferential direction of the fixed element 5.

According to the second invention, since the pinion gear 62 is further engaged with the pin rack 61 to move the high pressure water nozzle header 20, the high pressure water nozzle header 20 is reliably moved a certain distance.

According to the third invention, by rotating the air hood 6.7, the high pressure water nozzle header 20 is attached to the fixed element 5.
Clean in the circumferential direction.

The chain 67, which is provided so as to rotate in the circumferential direction of the fixed element integrally with the high-pressure water nozzle header 20, is connected to the rail 1.
When the impeller 69, which is configured to be moved in a direction parallel to the chain 9, reaches the position of the pawl 73, the impeller 69 is engaged with the pawl 73 and rotated, and the chain 6 is moved through the gear 65 and 66.
7 is moved, the high-pressure water nozzle header 20 is pushed by the chain 67 and the position of the fixing element 5 in the radial direction is automatically shifted, and in the same way as described above, the high-pressure water nozzle header 20 is fixed in the circumferential direction at the shifted position. Clean element 5.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the present invention, and the 12th
Portions common to those in FIGS. 1 to 16 are denoted by the same reference numerals, and therefore their description will be omitted.

Reference numeral 19 denotes a rail, one end of which is attached to the main shaft 8 side of the air hood 6 on the air 3 inlet side (that is, the exhaust gas 2 outlet side), and the other end is attached to the pin rack 14 that rotates integrally with the air hood 6, using bolts 18, respectively. It is detachably attached to the fixing element 5 and arranged in the radial direction of the fixing element 5.

20 is a self-propelled high-pressure water nozzle header that moves in the radial direction of the fixed element 5 along the rail i9.

Reference numeral 21 indicates a plurality of high-pressure water nozzles provided in the high-pressure water nozzle header 20, and 22 indicates a high-pressure water distribution path that opens on both sides of the high-pressure water nozzle header 20 and communicates with each high-pressure water nozzle 21.

23 is a running wheel provided on the high-pressure water nozzle header 20;
4 is a gear attached to the rotating shaft 25 of the running wheel 23; 26;
is a motor attached to the high-pressure water nozzle header 20, 27
is a gear that is attached to the rotating shaft of the motor 26 and meshes with the gear 24 on the rotating shaft 25 of the running wheel 23;
The driving force of 6 is transmitted to the running wheels 23 via gears 27, 24 and a rotating shaft 25.

Reference numeral 29 denotes a pressing ring provided on the high-pressure water nozzle header 20, and the high-pressure water nozzle header 20 runs with the rail 19 sandwiched between the traveling wheel 23 and the pressing ring 29.

30. 31 is a shaft support member for the running wheel 23 and the pressing wheel 29, 32 is a pressing shaft of the ring 29 for pressing, 33 is a set screw for removing the pressing shaft 32, 34 is a force adjustment screw for pressing the pressing shaft 32, 3
5 is a pressing spring.

3B is a high-pressure water pump provided outside the main body l, 37 is a high-pressure water pipe extending from the high-pressure water pump 3B toward the rotation center of the air duct 9, and 38 is attached to the end of the high-pressure water vibrator 37 on the rotation center side. 39 is a rotary joint 38
40 is a distributor that branches the high-pressure water hose 39; 41 and 42 are high-pressure water branch hoses that are branched at the distributor 40 and connected to the high-pressure water distribution passages 27 on both sides of the high-pressure water nozzle header 24; It is.

43 and 44 are strikers attached to the bottom of both ends of the rail 19, and 45 and 413 are limit switches attached to the bottom of the high-pressure water nozzle header 20, which are provided corresponding to the strikers 43 and 44 at the bottom of both ends of the rail 19, respectively. There is.

47 is a wheel, an air motor 48 and a reduction gear 4
A plurality of strikers 50 are attached to the outer periphery at regular intervals.

51 is a limit switch for detecting the amount of displacement in the circumferential direction of the fixed element 5 of the high-pressure water nozzle header 20, which is provided outside the main body 1 of the air preheater so as to be in contact with the striker 50 on the wheel 47.

Reference numeral 52 indicates a conduit that supplies air 53 to the air motor 48 of the drive mechanism 15, and 54 indicates a solenoid valve provided in the middle of the conduit 52.

55 is a control device, which receives signals 56.57 from a limit switch 45.48 attached to the high-pressure water nozzle header 20.
Input the running direction command 58 to the high pressure water nozzle header 20.
and a command for operating the drive mechanism i5 to the electromagnetic valve 54 by inputting the signals 56, 57 and the signal 59 from the limit switch 51 provided to be operated by the wheel 47 of the drive mechanism 15. A switching command 60 is output.

Next, the operation will be explained.

During periodic inspections, first stop the operation of the air preheater.

Next, leave the conventional soot blower 17 as it is, and use bolts 18 to attach one end of a rail 19 that is newly installed on the air hood 6 on the inlet side so that the high-pressure water nozzle header 20 can move in the radial direction of the fixed element 5. It is detachably attached, and the other end is attached to a pin rack 14 that rotates together with the air hood 6 using bolts 18.

A self-propelled high-pressure water nozzle header 20 is mounted on the rail 19,
Signal 5 between the ladder 20 and the control device 55 to the high pressure water nozzle
[i, 57 and the running direction command 58 are connected to each other, and also connected between the drive mechanism 15 and the control device 55 so that the signal 59 and the switching command 60 can be transmitted thereto.

Connect the external high-pressure water pump 36 to the high-pressure water nozzle header 20 via the high-pressure water pipe 37, rotary joint 38, high-pressure water hose 39, distributor 40, and high-pressure water branch hose 41, 42 to set up the water washing device. .

Note that the rotary joint 38 and the like may be permanently installed in the air preheater.

After setting the water washing device, the high pressure water pump 36 is activated, and the high pressure water nozzle header 20 is run along the rail 19 to start operation of the water washing device.

Then, the high-pressure water nozzle header 20 is connected to the rail 19, for example.
travels from the end on the main shaft 8 side to the end on the pin rack 14 side, and at this time, the high pressure water discharged from the high pressure water pump 36 is transmitted to the high pressure water pipe 37, the rotary joint 38, the high pressure water hose 39, and the distribution pipe 37. The water is supplied to the high-pressure water distribution path 22 of the high-pressure water nozzle header 20 through the high-pressure water branch hose 41 and 42, and is distributed from the high-pressure water distribution path 22 to each high-pressure water nozzle 21, and then from the high-pressure water nozzle 21. The ejection fixing element 5 is cleaned in the radial direction.

Pin rack 14 with high pressure water nozzle header 20 on rail 19
When the end of the side is reached, the limit switch 45 attached to the high pressure water nozzle header 20 touches the pin rack 1 of the rail 19.
A signal 56 is output from the limit switch 45 upon contact with the striker 43 attached to the end on the 4 side. The output signal 56 is input to the control device 55, and when the control device 55 receives the signal 56 from the limit switch 45 manually, it outputs a running direction command 58 to reverse the running direction of the high-pressure water nozzle header 20, and at the same time switch the running direction. A command 60 is output to open the solenoid valve 54, and the air 53 is supplied to the air motor 48 from the conduit 52 to drive the air motor 48.

As a result, the air motor 48, reducer 49, pinion 1
The air hood 6 on the inlet side starts rotating through B, the wheel 47, and the pin rack 14, and rotates together with the rail 19 integrated with the air hood B and the high-pressure water nozzle header 20 on the rail 19.

In this way, when the high-pressure water nozzle header 20 is rotationally displaced by a predetermined angle, the rotation of the wheel 47 attached to the binion 16 of the drive mechanism 15 causes the striker 50 protruding from the wheel 47 to contact the limit switch 51 and set the limit. A signal 59 is output from the switch 51. The output signal 59 is input to the control device 55, and when the control device 55 inputs the signal 59 from the limit switch 51, it outputs a switching command eO, closes the solenoid valve 54, and stops the supply of air 53 to the air motor 48. Then, the drive of the air motor 48 is stopped.

As a result, the high-pressure water nozzle header 20 cleans the fixed element 5 while moving on the rail 19 from the pin rack 14 side toward the main shaft 8 side, contrary to the above, at a position slightly shifted in the circumferential direction of the fixed element 5. I'll go.

Thereafter, each time the high-pressure water nozzle header 20 reaches the end of the rail 19, the running direction of the high-pressure water nozzle header 20 is reversed and the circumferential position of the fixed element 5 is slightly shifted, as shown in FIG. The fixed element 5 is cleaned in this manner, and the cleaning is completed when the rudder 20 goes around the fixed element 5 once to the high-pressure water nozzle.

By using high-pressure water in this manner, the sulfuric acid content that blocks the fixing element 5 and the natural substances attached to the sulfuric acid content are completely washed away.

At this time, high-pressure water branch hoses 41 and 42 are connected to both sides of the high-pressure water nozzle header 20 to supply high-pressure water from both sides, so the reaction force of the high-pressure water is applied to both sides of the high-pressure water nozzle header 20. cancel each other out.

Note that by tightening the force adjustment screw 34, the pressing spring 35 and the pressing shaft 32 press the ring 29 against the flange of the rail 19, increasing the running resistance of the high-pressure water nozzle header 20. By adjusting running resistance, high pressure water nozzle header 2 is activated by reaction force from high pressure water.
0 is prevented from accidentally moving in the longitudinal direction of the rail 19.

FIGS. 6 and 7 show other embodiments of the present invention, in which the rail 1
The configuration is substantially the same as that of the previous embodiment, except that a pin rack 61 is used as the pin rack 9, and a pinion gear B2 that meshes with the pin rack 81 is used as the running wheel 23 of the high-pressure water nozzle header 20, and similar effects are obtained. be able to.

FIGS. 8-10 show another embodiment of the present invention.

A rail 19 is attached along the side of the air duct 6 on the air 3 inlet side (that is, the exhaust gas 2 outlet side) using a bracket 63, and a high-pressure water nozzle header 20 without a drive device is placed on the rail 19.

A pair of gears 65 and 68 are rotatably disposed near both ends of the rail 19 using brackets 64, respectively.
A chain 67 parallel to the rail 19 is stretched between the rails 19 and 88.

An impeller 69 is integrally attached to the lower end of the rotating shaft 68 of the gear B5 that is closer to the exhaust gas duct 13, and
A pit 70 protruding outward from the main body l of the air preheater 0 is formed at one location in the circumferential direction of the air preheater 3, and a claw 73 that engages with the impeller 69 is attached to a pin 74 inside the pillef 0 using a bracket 71 and a spring 72. It is supported so that it can swing around the center.

A hook 75 that pushes the high pressure water nozzle header 20 is attached to the chain 67.

Then, when the air hood 6.7 is driven to rotate, the high-pressure water nozzle header 20 moves in the circumferential direction of the fixed element 5 while staying at the same position on the rail 19 together with the air hood 6 on the inlet side. , cleaning the fixing element 5 in the circumferential direction.

When the high-pressure water nozzle header 20 cleans the fixed element 5 for one round, the impeller 69 engages with the pawl 73 provided at one circumferential location of the exhaust gas duct 13 on the outlet side, changing the phase of the impeller 69, and the impeller 69 By rotationally displacing the gear 65 integrated with the rotating shaft B8, the high pressure water nozzle header 20 is moved to the rail 19 via the chain 67 and the hook 75.
to change the radial position of the fixing element 5 of the high-pressure water nozzle header 20.

Thereafter, by repeating the above steps, the fixed element 5 is cleaned as shown in FIG. 11, and the cleaning is completed when the high-pressure water nozzle header 20 has moved from one end of the rail 19 to the other.

At this time, if the pawl 73 receives a force stronger than the tensile force of the spring 72, it can swing around the pin 74 and escape, so an excessive force is applied between the impeller 69 and the pawl 73, causing damage. Accidents that may occur are prevented.

It should be noted that the air preheater water washing device of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the air preheater water washing device of the present invention, various excellent effects as described below can be achieved.

(2) Since the fixed element can be automatically cleaned, a uniform cleaning effect can be obtained and the cleaning time can be shortened.

■ High pressure water is used, so a high cleaning effect can be obtained.

(2) According to the second invention, the high-pressure water nozzle header can be reliably moved a certain distance.

(2) According to the third invention, since the rotational force of the air hood is utilized, there is no need to provide a special drive device to the high-pressure water nozzle header.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a partial sectional view of an embodiment of the present invention viewed from the side;
Figure 2 is an overall view of Figure 1 viewed from ■-■ direction, Figure 3 is an enlarged view of the high-pressure water nozzle header, Figure 4 is an enlarged view of the wheel and limit switch, and Figure 5 is the same as Figure 1. FIG. 6 is an enlarged view of the rail and high-pressure water nozzle header portion in another embodiment of the present invention; FIG. 7 is a view taken along the ■-■ arrows in FIG. 6; FIG. 8 is a sectional view of another embodiment of the present invention viewed from the side, FIG. 9 is a view taken along the line IX-IX in FIG. 8, FIG. 10 is a view taken along the line XX in FIG. 8,
Fig. 11 is a plan view showing the travel path of the high-pressure water nozzle header in Fig. 8, Fig. 12 is an overall side view of the air preheater, and Fig. 13
The figure is a partially enlarged view of FIG. 12, FIG. 14 is a partially omitted perspective view of FIG. 12, FIG. 15 is a perspective view of the air hood of FIG. 12, and FIG. TE is a perspective view of a fixing element. . In the figure, l is the main body of the air preheater, 2 is exhaust gas, 3 is air, and 5
is a fixed element, 6 is an air hood on the air 3 inlet side and the exhaust gas 2 outlet side, 7 is an air hood on the air 3 outlet side and on the exhaust gas 2 inlet side, 12 is the exhaust gas duct for the exhaust gas 2 population, 13 is the exhaust gas 2 outlet side exhaust gas duct, 15 is the drive mechanism of the air hood 6.7, 19 is the rail, 20 is the high pressure water nozzle header, 45.46.51 is the limit switch, 5
5 is a control device, 56, 57.59 is a signal, 58 is a running direction command, 60 is a switching command, 61 is a pin rack, 62 is a pinion gear, 85.66 is a gear, 67 is a chain, 69
indicates an impeller, 73 indicates a pawl, and 75 indicates a hook. Figure 4 Figure 5 Figure 6 Figure 7 Figure 11

Claims (1)

[Scope of Claims] 1) A cylindrical fixed element 5 provided in the center of the main body 1 of the air preheater that exchanges heat between high-temperature exhaust gas 2 and air 3, and whose interior is partitioned radially; A pair of air hoods 6 and 7 facing each other at both the inlet and outlet sides of the exhaust gas 2 of the fixed element 5 and rotating synchronously along the end surfaces of the fixed element 5; and a drive mechanism 15 for the air hoods 6 and 7. A rail 19 in the radial direction of the fixed element 5 provided on the air hood 6 on the gas outlet side of the fixed element 5, and a self-propelled high-pressure water nozzle header 20 running along the rail 19.
and is attached to the high pressure water nozzle header 20, and the rail 1
limit switches 45 and 46 for detecting both ends of 9;
A limit switch 51 that detects the amount of displacement in the circumferential direction of the fixed element 5 of the high-pressure water nozzle header 20, and signals 56, 57, 5 from each of the limit switches 45, 46, 51.
9 is input, and when the high-pressure water nozzle header 20 reaches the end of the rail 19, a running direction command 58 is outputted to the high-pressure water nozzle header 20 to reverse the running direction, and
A water washing device for an air preheater, comprising a control device 55 that outputs a switching command 60 for operating the drive mechanism 15 so that the position of the high-pressure water nozzle header 20 is displaced in the circumferential direction of the fixed element 5. 2) The water washing device for an air preheater according to claim 1, wherein the rail 19 is a pin rack 61, and the running wheel provided on the high-pressure water nozzle header 20 is a pinion gear 62 meshing with the pin rack 61. 3) A cylindrical fixing element 5 with a radially partitioned interior and provided at the center of the main body 1 of the air preheater that exchanges heat between high-temperature exhaust gas 2 and air 3, and both ends of the fixing element 5. Exhaust gas duct 1 on the inlet side and outlet side connected to
2, 13, and a fixing element 5 provided inside the exhaust gas ducts 12, 13 and facing each other on both end surfaces of the fixing element 5.
A pair of air hoods 6, 7 rotate synchronously along the end faces, a rail 19 in the radial direction of the fixing element 5 provided on the air hood 6 on the gas outlet side of the fixing element 5, and a rail 19 movable along the rail 19. A high-pressure water nozzle header 20 is arranged, and a pair of gears 6 are located at both ends of the rail 19 provided on the air hood 6 on the gas outlet side.
5, 66, and a chain 67 having a hook 75 that is stretched between the gears 65, 66 and pushes the high-pressure water nozzle header 20.
An air preheater comprising: an impeller 69 provided coaxially with a gear 65 on the outer peripheral side of the fixed element 5; and a claw fixed to the exhaust gas duct 13 on the gas outlet side and engaged with the impeller 69. water washing equipment.